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'''Proxima Centauri''' is a class M5 [[Red dwarf]] star in the constellation of Centaurus.  At just over 4.22 [[Light year]]s away Proxima Centauri is the nearest star to the [[Solar System]].  It was first discovered in 1915 by the astronomer Robert Innes and is not visible by the naked eye. It is often considered the third star in the [[Alpha Centauri]] system due to having the same proper motion as Alpha Centauri A & B.  Due to the star's great distance of around 15,000AUs (roughly one-fifth of a light year) from Alpha Centauri A & B, astronomers debate if Proxima Centauri is gravitationally bound to the other two stars.

'''Proxima Centauri''' is a spectral class M5.5 Red dwarf [[star]] in the constellation of Centaurus.  At just over 4.22 [[Light year]]s away Proxima Centauri is the nearest star to the [[Solar System]].  It was first discovered in 1915 by the astronomer Robert Innes and is not visible by the naked eye. It is often considered the third star in the [[Alpha Centauri]] system due to having the same proper motion as Alpha Centauri A & B.  Due to the star's great distance of around 15,000AUs (roughly one-fifth of a light year) from Alpha Centauri A & B, astronomers debate if Proxima Centauri is gravitationally bound to the other two stars.

Due to the close proximity of the star, its angular diameter can be measured directly, revealing a diameter 14.5% the size of our Sun.  Proxima Centauri appears to have only 10.7% of the sun's mass, and a visual luminosity so low, it would be 19,000 times less luminous then our Sun is if it were at the same distance<ref>http://www.solstation.com/stars/alp-cent3.htm</ref>.

Due to the close proximity of the star, its angular diameter can be measured directly, revealing a diameter 14.5% the size of our Sun.  Proxima Centauri appears to have only 10.7% of the sun's mass, and a visual luminosity so low, it would be 19,000 times less luminous then our Sun is if it were at the same distance<ref>http://www.solstation.com/stars/alp-cent3.htm</ref>.